GT2 belt clamp w/tension

thingiverse

I acquired GT2 belts for my Ultimaker printer, which were initially too long. After cutting them to approximately 30cm length, I created a clamp with a 6mm wide groove for 7mm belts. The clamp's holes accommodate M3 bolts for assembly. To manage tension, I implemented two new bottom parts with added 3mm holes, enabling the use of 20mm M3 bolts and nuts. A photo showcases the successfully adjusted tension between the two clamps. Due to limited space around the belts in the Ultimaker, I positioned the bolt holding the belts centrally within the clamp, necessitating a hole punch in the belt (as shown in the image). To ensure clearance for M3x10mm bolts within the plywood of the printer, I shortened four bolts to 6mm. Belts on the front and back tensioners are mounted lower on the belt, requiring 10mm bolts. To determine the correct length of the new GT2 belts, I measured the original Ultimaker belts with a ruler inside the belt at one side while tightening it against the ruler, resulting in 30cm. The belts marked 300 should be accurate. After cutting the belt, I curled it around the ruler and down to 30cm again, leaving room for tension adjustment by removing two teeth from the belt.