cr-30 belt

I’m also using a Pi-Zero-W as both a GCode sender and as a web-cam. It provides a live feed and also takes snapshots at each layer of a print and can generate a time-lapse when a print is done. This is using still-in-development code from the GridBot project.

the X axis suffers from torsional loading due to the angle of the head. this is a really bad place to use roller wheels to hold something in place. that loading pattern will, over time, destroy the wheels. the Y axis can get away with this because it’s a beam held in two locations which prevents uneven loading. the stock X wheels are also known to be installed poorly. if this happens or if they are degrading, prints will start to fail.

the linear rail is a more rigid motion system with all metal parts that have very tight tolerances. it will not fail over time and provides a much more reliable base to mount the head. this upgrade is mandatory if you plan to add direct drive at any point since that will increase the weight of the head and thus torsional loading on the X axis.

Infinity-corrected objectives are ideal for research-grade biomedical industrial applications especially when additional components (such as filters, dichroic mirrors, polarizers) are needed in the microscopy system. Adding optical plate components in the infinity space (shown in the Fig.2 labelled as “Parallel Optical Path) between the infinity-corrected objective and tube lens will not introduce spherical aberration, or change the objective’s working distance.

The most common immersion media are air, water, oil, and silicone. Choosing the appropriate objective designed for your immersion medium will result in higher resolution images.

I initially upgraded my board to get Marlin’s linear advance. And this did help. But I put Klipper on my second CR-30, and it has been far better with nozzle pressure advance at eliminating the need for retractions, reducing print time, and improving print quality.

Objective lenses are used in microscopy systems for a range of scientific research, industrial, and general lab applications. A microscope objective is typically composed of multiple lens elements and located closest to the object. There are so many types of microscope objectives available, choosing the right objective can help you produce good quality images at a reasonable cost.When choosing a microscope objective, we will need to consider a number of factors including conjugate distance, numerical aperture (NA), magnification, working distance, immersion medium, cover glass thickness, and optical aberration corrections. In this article, we will discuss how to choose the right microscope objective.

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r better with nozzle pressure advance at eliminating the need for retractions, reducing print time, and improving print quality.

Work in progress / it works so I'll let someone else take the reigns. So I was upgrading my cr-30 and couldn't get belt adhesion afterwards. It occured to me that if I changed the angle of the print head I could solve the problem. It...

CR-30 extruder

hot end kit: https://www.amazon.com/dp/B0751BMYJB 50W heater: https://www.amazon.com/dp/B08H4QXSM5 thermistor: https://www.amazon.com/dp/B07Y4NYMSN silicone tape for heat block (found in a drawer)

@stewart i’ve been watching your posts about the creality cr-30 and saw you did a great job with him! recently i bought one and my intention is make cosplay props and long parts but im a bit lost with wich improvements i must do to her to secure good impresions and good quality!

Hello again. I upgraded my motherboard to skr 1.4 and I’m wondering what code base you used and if you can link it. I compiled the https://github.com/CR30-Users/Marlin-CR30/tree/2.0.x_cr30/Marlin code base. Everything in config.h seems to be wrong, stepper motors (except Z) all wrong direction, and probably some other stuff. I still have to get steps per mm (seems way off) and I haven’t got the ends stops working. Once again, thanks for the good work. I plan on submitting the config.h and config_adv.h to the git when I get it finished. However it is possible I’m chasing the wrong rabbit.

I haven’t experienced layer shifting with the stock board or the SKR. But I have noticed that layer banding is often caused by a combination of:

I do have the conf*.h files on a computer in the lab. I won’t be able to get to it until Friday. But I can post them then. They’re for 1.3, which should be really close to 1.4

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Could you do a resume after your tests wich will be the best parts or components to buy/ upgrade? any tips for someone whos realitvely new in the 3D impression world and more with the creality CR-30? thanks!

I’ve been working on upgrades to a CR-30 with the goal of better / faster print quality and higher temps with access to more materials. For a first pass, I’m using parts I’m familiar with and have on hand:

I have a working upgrade now. Yeah. I have modified the hot end holder and want to publish the results giving you credit for the base models if that is OK? If not I can send you the updates and link them in my write ups? Thanks

CR 305e

Love your project. I’m getting ready to upgrade my CR30 motherboard and X Y to closed loop sensors to the steppers. I was wondering about the what you had to do to get Marlin configured for the CR30 / advice about upgrading motherboard. FYI - the reason for my upgrade is layer shifting sucks on 20+ hour prints. I upgraded my sapphire core XY and the layer shifting went away. Thanks, Michael

Many objective lenses are corrected for infinite conjugate distance, while others are designed for finite conjugate distance applications. Compared to infinite conjugate objectives which need a secondary lens (also called tube lens), a finite conjugate objective can generate an image of a specimen by itself.A finite conjugate objective, as shown in Figure 1, is a good, economical choice for a simple microscopy system.

loosening 5 bolts (leaving the center bolt closest to the end of the leading edge of the belt tight) provides some ability for the bed to expand without warping. the belt tension will hold the bed down.

Objective lenses are used to magnify an image. In addition to numerical aperture, magnification is also an important parameter. The objective magnification typically ranges from 4X to 100X. As the image sensor size or eye observed area is fixed, the field of view of a microscopy system changes with the magnification of the objective lens. Typically a lower magnification objective lens will have a larger field of view and lower resolution, and a higher magnification objective lens will have a smaller field of view and higher resolution.The diameter of the FOV can be calculated by using the following formula:FOV= FN/MagThe field number (FN) in microscopy is defined as the diameter of the area in the image plane that can be observed through the eyepiece or image sensor.

Usually the working distance (WD) refers the distance from the front lens element of the objective to the observed object when the object is in sharp focus. Objective lenses with long working distance are needed for many scientific research applications such as atom trapping and analyzing fluid samples that require putting an object in a chamber.The resolution of a microscopy system can be significantly affected if the observed object is not placed on the designed object plane, especially for an objective with high NA.

A dry objective is designed to work with the air medium between the specimen and the objective lens, while an immersion objective requires a liquid medium to occupy the space between the object and the front element of the objective for enabling a high NA and high resolution. Figure 4 shows the oil immersion objective, which can collect more light (i.e., have a higher NA) compared to a dry objective.

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The most important parameter of a microscope objective is the numerical aperture (NA). NA measures the microscope objective’s ability to gather light and determines the resolution of a microscopy system.

E3Dv6 Hot End (or clone) Hardened Steel Sharp Nozzle 40mm fans SKR v1.3 / SKR Mini V2 / BigTreeTech RRF control board USB / buck converter to power the Pi

IMG_8483 copy3024×4032 3.39 MB IMG_8486 copy3024×4032 3.18 MB IMG_8489 copy3024×4032 3.84 MB IMG_8490 copy3024×4032 2.15 MB IMG_8514 copy3024×4032 3.35 MB IMG_8518 copy3024×4032 3.22 MB IMG_8525 copy1512×2016 1.33 MB

a more permanent and reliable fix is to add 12mm aluminum shims under the center of the bed to physically prevent it from warping down. I have used old E3D heater blocks (which have one side at 12mm) held in place with kapton tape. if your bed is already warped (or suspected), then use a straight edge across the bare bed with a light behind it to confirm

Short low effort video So I was upgrading my cr-30 and couldn’t get belt adhesion afterwards. It occured to me that if I changed the angle of the print head I could solve the problem. It worked.

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once calibrated, your printer will then be reliable. these changes cover 95% of the common failure modes. other recommended upgrades (firmware or hardware) are for performance and should be done after these.

the CR-30 heated bed installation suffers from a design flaw. it is constrained at 6 points along the edge. when the bed is heated above 60C, it starts to warp (expanding metal needs to go somewhere). if it is held at higher temps for any period of time the warp becomes permanent. because of gravity, the warp goes down creating a dip in the middle of the bed. this turns the belt into a drum floating over the bed. any amount of space, even 0.01mm, between the belt and bed means prints will not stick reliably.

I have found that belt printing is much more sensitive to flow rates. Over-extrusion leads to dragging of the part, nozzle interference, and eventually a shift of print failure. It also just happens with some filaments with stringing, oozing, or other artifacts. Because the belt flexes, any perturbation of the part results in rocking and possible freeing of the part from the belt.

the CR-30 uses a very long bowden tube which means longer retractions are required for clean prints. this puts stress on the couplers and increases the likelihood of a hot end clog. the stock couplers are weak and fail often. the capricorn tubing has a smaller inner diameter. this means less retraction is required.

First thank you for your response. I will look into that your recommendations. When I talk about layer shift I am referring to a cm shift probably due to a nozzle drip. When I added the closed loop to my other printers XY steppers the cause still happened, but the machine compensated and the print came out well with just a single bump / defect. To put the closed loop parts in I need to bypass the stepper motor drivers, so I need to upgrade the motherboard and I just happen to have an SKR 1.4 laying around to do that. Again thank you for the time and sharing of knowledge it is appreciated.

As of now, I have one CR-30 running Marlin on an SKR v1.3 and one running Klipper on the stock Creality board. Both of these give me nozzle pressure management, which is key.

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The optical aberration corrections determine the optical performance of an objective lens. According to the degrees of the aberration corrections, objective lenses are typically classified into five basic types: Achromat, Plan Achromat, Plan Fluorite (Plan Semi-Apochromat), Plan Apochromat, and Super Apochromat. Choosing an objective with a proper aberration correction level will help you build a microscopy system at a reasonable cost.

SO offers a wide range of objective designs, which provide various degrees of optical aberration corrections for supporting different needs, such as achromatic objectives (the cheaper objectives) for laboratory microscope applications and long working distance apochromats (expensive objectives) for biological and scientific research applications. We can help you choose or design a properly corrected objective lens for meeting your application requirements.

Thanks stewart. I modified your onshape files in fusion 360 and solved my bed adhesion problems. Here is a really quick youtube video where I talk about it over octo-lapses

Thanks. There were a couple issues I found in my files after comparing them to yours. Also thinking about doing the volcano upgrade, and debating kippler.