Problem: Observed endstop swing arms being able to sneak behind Front Belt Holder Adjustment Screws during less than perfect homing scenarios, which are very common when first getting set up, and when things go pear shaped.
Fix:
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For just the adjustment screws in the Front Belt Holders, recommend switching to Button Head instead of stock Pan Head bolts. Do not use Flanged Button Head bolts. Reason is that the stock Pan Head have a curved profile that endstop swing arms can sneak behind.
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Consider using some number of M3 washers behind head of the adjustment screw so there's no gap for the swing arm to sneak behind, or, consider these printable parts (PETG 0.6mm nozzle, 0.2mm layer height worked for me):
- y_belt_min_pad.stl
- y_belt_max_pad.stl
- belt_holder_pads.3mf - Both parts oriented for printing.
Am personally using these spacer pads for now, BUT, this requires I calibrate and configure FluidNC Pulloff distance values so that XY motion is not skewed.
My setup also has strips of 3.5" x 3/4" ply runners that were clamped and shifted around until I was happy with XY being square. All of this is to say that I didn't mind the pads effectively being a 3mm washer.
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uxcell M3x10mm Machine Screws Pan Phillips Cross Head Screw 304 Stainless Steel Fasteners Bolts 100Pcs https://www.amazon.com/gp/product/B07MF3RN7M |
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M3 x 10mm Thread Pitch 0.5 mm Stainless Steel 304 Hex Socket Button Head https://www.amazon.com/iExcell-Stainless-Socket-Button-Screws/dp/B08H2HSPQD |
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M3-0.5 x 10mm Flanged Button Head Socket Cap Screw Bolts, 304 Stainless Steel 18-8, Allen Socket Drive, Bright Finish, Fully Threaded, Pack of 100 https://www.amazon.com/gp/product/B08CC6VDN1 |
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