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Lars' v2 Ultimaker XY Blocks
Second generation of my XY blocks. Improved throughout!3D printer parts and enhancements
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After switching to a GT2 belt configuration, and needing a solid belt clamping mechanism without the complications of integrated tensioning, I decided to design my own XY blocks.
The factory bronze bushings are very prone to clamping deformation and bind, so I wanted something with separate bushing and belt clamping. I designed these around some replacement bushings I got from Robotdigg that have a 12mm OD instead of the stock 11mm.
I made allowances to insert M3 nuts into the blocks for all connections, so no plastic threads are relied on. The one exception being that I left holes in the block back face to thread in an M3 bolt in various positions to trip the limit switches. You decided which need a bolt, and where, for limit switch triggering. Mock it up first, because you won't be able to install those bolts once the block and perimeter shafts are installed.
One of the biggest benefits of this design is the ability to square the print head by loosening a single bolt on each block to release the belt. This means no more fumbling with pulley set screws! The other benefit of this is that once the belt is released, there is almost no drag compared to loosening pulleys where you are still moving belts and spinning pulleys on the 8mm shafts. This gives you a MUCH more clear picture of how freely your print head moves. I actually discovered that my printed print head was holding the 6mm shafts slightly out of square, so forcing them square to the 8mm shafts actually induced bind! You can simply loosen the belt clamps on two opposing XY blocks, move the print head back and forth by hand and reclamp.
Materials and methods
-(8) M3x14mm [for 6mm clamp]
-(4) M3x10mm [for belt clamp]
-(4) M3x20mm [for bushing clamp]
-(4) M3x12mm [for limit switch tripping]
-(16) M3 Nuts
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Ouah that was fast! Thanks a lot!!!
I hope my GT2 belts and pulley's will be here soon!
@Curven, I didn't notice the fact that these were designed for 12mm bushing vs. the standard 11mm ones on the UMO+ until you mentioned it. That explains why the bushings were loose in the blocks I printed. However, I solved it by wrapping a strip of paper (a Post-It note in my case) around the bushing a couple of times as a shim. This has been working fine for about 9 months, but I have had to tighten screws once. Recently I added a dab of white glue to the bushings to keep them from sliding. Some Loctite on the screws probably would have helped as well.
11mm bushing version added!
Hi CCS86, would it be possible to share the 3D files or upload a Version for 11mm bushings please? Thank you very much.
The back block has extra clearance for the Z stage bushings, which you may or may not need it depending on your platform / print head configuration.
I'm finally getting started on a GT2 belt/pulley upgrade for my UMO+ and I saw these v2 blocks. I'm trying the figure out the difference between the regular and "back" XY block. Does the "back" XY block go in a particular position and what is its purpose? Thanks.