The 100 Rigid Gantry

This aims to improve print quality at higher accelerations on The 100 based printers that have larger build volumes. While the printed parts are now actually ~0.7g lighter than the v1.1 gantry according to the slicer, and the M5 bolts have been replaced with lighter M3 bolts, the goal is not to enable higher maximum acceleration, but instead to improve print quality at high acceleration.

In order to install the idlers you must first press fit the spacers into the bearings to make up for the size difference between the M5 and M3 bolts. There may be tolerance issues due to different material shrinkage rates, but you should be able to either scale in the slicer or easily design a replacement spacer.

I recommend using the printed washers instead of metal ones as they have an M3 sized ID and M5 washer OD, and the thickness will likely be more accurate than metal washers.

Hardware

• 2x M3 30mm bolts
• 2x M3 25mm bolts
• 2x LM8LUU bearings (I used https://www.amazon.com/gp/product/B083XQTH41 )
• 8x M3 heat inserts (I used https://www.amazon.com/dp/B09MCWTBCC )
• The idler bearings from the original gantry
• M3 screws from the original gantry for the bearing clamps. 

Print Settings

I recommend consulting the Orca Slicer .3mf project file. It is important to print the gantry sides in the given orientation (also pictured for reference) to cancel any skew in the print.

• 0.25 layer height
• 0.5 line width
• 3 walls
• 1.5 mm top and bottom thickness
• 25% cubic infill
• Supports on

Changelog

• v2.1 Gates
  • Updated spacing for genuine Gates idler pulleys. Note that the toolhead carriage used may need to have updated belt locatiosn. An example toolhead .stp file is included with proper belt locations.
• v2.0
  • Fixed clearance issues causing 10mm lost x travel when used with v1.1 toolhead.
  • Lower weight bearing clamps.