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 Continue #plotterbuild today, left side of pen rail: y axis belt/roller mount and X axis belt tensioner. Parts:

Pen rail assembly 
1x 5x12mm machine bolt
1x 5mm bore 20 tooth GT2 idler pulley 
Printed Tensioner housing
Printed tensioner and tensioner nut (not shown)
Printed left side y axis belt/roller mount 
2x 3x12mm machine bolts 
2x 3mm t nuts
2x 5x30mm machine bolts 
2x printed wheel bushings
2x mini roller wheels 
2x 5mm nylock nuts
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/788/276/430/731/original/75a260e9802bdcfb.jpeg
 
 The belt/roller mount is the same as yesterday, mirror reversed. Assemble as before and add to left side of pen rail a few cm from the end. Exact position to be determined later. The rollers should be on the bottom, as on the right side of the rail.
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/809/632/752/415/original/351e93e94b37d74d.jpeg
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/809/845/728/519/original/b8fc4f4ba550644a.jpeg
 
 Use the Allen wrench to get the 5x12mm bolt in place in the centre hole of the tensioner housing. Fasten it to The end of the pen rail, so the slots in the housing are on the side of the rail, and the nubs slide into the extrusion on the top/bottom.
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/828/319/134/288/original/026d9a2872f615b3.jpeg
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/828/580/267/979/original/03c8bfea3109416b.jpeg
 
 Assemble the tensioner, idler pulley and printed axle as before. Screw on the tension nut and pop the result it into the tensioner housing. 

Next time we’ll square, size and align the frame and rail, and add the y axis belts. Monday, maybe!
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/838/789/964/490/original/2e8066c3ce5bec6a.jpeg
https://cdn.masto.host/mastodonart/media_attachments/files/112/615/839/042/825/341/original/09fa9432064fe780.jpeg
 
 One of the design goals for the machine was to standardize on bolt sizes and lengths to make is easier to shop for. All the axle bolts are the same, 30mm. Every other bolt is 8, 12, 16 or 20 mm in length.