There are two items which appear to be missing from the original BOM:
1) a small dowel pin to hold the 608zz bearing in place on the extruder idler - I've been using a piece of plastic tubing just to keep the build going along but I'm at a point now where I want to put the right part in place. Richrap's blog mentions using a M8 x 20mm smooth or threaded rod for this purpose. Anyone know where I can buy smooth rod cut to length online? I found plenty of it on McMaster, but they sell it by the foot and I don't have any tools handy to cut it. The part I'm talking about is seen here: [www.youtube.com] (side note: this video would be helpful to link in your blog to help along with assembly of the extruder). Looks like I could buy the vitamins for $20 from MakerFarm: [www.makerfarm.com]
2) long M3 screws to use to hold the idler down against the main extruder body. I bought some M3 x 45mm's thinking they'd be long enough (not listed in the BOM) and they're still too short to use with the springs from the printrbot simple (they're short just about the height of the uncompressed spring which is 20mm). The spring looks like it will compress 5mm to 10mm easily, so it appears I could get by with M3 x 60mm's, which is the longest that McMaster sells, although a set of 25 is $8.
At $8 + S/H from McMaster just for the screws, I'm tempted to just buy the hardware only kit from MakerFarm for $15 + S/H and wind up with a few spare bits, but I'm curious to know what everyone else did.
1) a small dowel pin to hold the 608zz bearing in place on the extruder idler - I've been using a piece of plastic tubing just to keep the build going along but I'm at a point now where I want to put the right part in place. Richrap's blog mentions using a M8 x 20mm smooth or threaded rod for this purpose. Anyone know where I can buy smooth rod cut to length online? I found plenty of it on McMaster, but they sell it by the foot and I don't have any tools handy to cut it. The part I'm talking about is seen here: [www.youtube.com] (side note: this video would be helpful to link in your blog to help along with assembly of the extruder). Looks like I could buy the vitamins for $20 from MakerFarm: [www.makerfarm.com]
2) long M3 screws to use to hold the idler down against the main extruder body. I bought some M3 x 45mm's thinking they'd be long enough (not listed in the BOM) and they're still too short to use with the springs from the printrbot simple (they're short just about the height of the uncompressed spring which is 20mm). The spring looks like it will compress 5mm to 10mm easily, so it appears I could get by with M3 x 60mm's, which is the longest that McMaster sells, although a set of 25 is $8.
At $8 + S/H from McMaster just for the screws, I'm tempted to just buy the hardware only kit from MakerFarm for $15 + S/H and wind up with a few spare bits, but I'm curious to know what everyone else did.
