RS-CNC32 Alternative Belt Holders and Tensioners for 1 1/4" Tube Build

thingiverse

The use of 1 1/4" steel tubes and HTheatre's excellent GT2 20T smooth pully update led to two issues with my RS-CNC32 build: - belt interferences on both x and y axes - insufficient space between x dolly components for standard M8 nuts These alternative parts eliminate belt and hardware interferences/clashes and achieve horizontal belt paths for this machine configuration for both the x and y axes. The "y belt" part is also reinforced, and reverses the fastener direction to permit removal and replacement of the "belt hold" part without disassembling the y dolly. The parts are derived from both the original MakerFr parts (https://www.makerfr.com/en/cnc/rs-cnc32/presentation-rs-cnc32/) and loadinglevelone's "RS-CNC 32 - X belt tensioner - remix" (https://www.thingiverse.com/thing:4724117). Note that the X Chain part also suffers from the geometry differences of this configuration. See my "RS-CNC32 Drag Chain parts for 1 1/4" Tube Build" parts (https://www.thingiverse.com/thing:4821931) All of these parts are compatible with my "RS-CNC32 Reinforced Thickened Parts for 20 x 100 Extrusions and 1 1/4" Square Tubes" (https://www.thingiverse.com/thing:4821729). Final note: HTheatre from the MakerFr forums has noted that a GT2 25T (vs. 20T) smooth pulley may help alleviate some belt interferences. However, the use of the 1 1/4" tubes typically available in North America may be exacerbating the problem. Also, I found that sourcing a GT2 25T pulley was difficult (without ordering from China), while GT2 20T smooth pulleys were readily available on Amazon.