Tuesday, July 16, 2013

I decided to sell my second Printer. It's a great little thing. I'm definitely going to do some upgrades on the older one to make it more like this one. I think I also want to make a smaller one,   such as a Tantillus. Mendel size printers are great, but I need an apartment sized machine, a bit smaller, fits on the kitchen counter easily. Well I have most of one printer broken in a corner. My first printer which was partially sacrificed should be rebuilt first.

Wednesday, July 3, 2013

Prusa Mendel 0002

So, this is nearly working now. It's a Prusa Mendel i2, I've tentatively labeled it Prusa 0002, classy right? It turned out that PLA LM8UU bushings needed a little work, I ran an m8 threaded rod through them. When I reinstalled the bushings they work great on the m8 smooth rods. Then I turned up the motor controllers until they didn't whine or overheat. All the axises seem to be working. I managed to print a small gear, that looks great.. 0.28mm layer height, god that looks great. The final problem I have is the extruder is consistently destroying plastic filament instead of pushing it to the extruder hot end.

The machine though is really clean and looks good. All Black ABS, and Green PLA Bushings. The wiring is all cut to length and then I used a green paracord to wrap the wires. The Z-motors actually had to be rewired since the wires weren't long enough to get around the frame and to the base. I'm using a sanguinololu, heated bed, and a budaschnozzle. The Budaschnozzle hot end is great. just great. I'm going to post about each bit that makes this machine unique in the next couple days. until then...

Tuesday, June 4, 2013

Well I should have movement, but the cheap LM8UU bearings I bought are... well, cheap. They're binding too much on the 8mm smooth bar I bought at McMaster Carr.  I suppose I'll print some PLA bushings to replace them. So, a quick plastic switch in my main printer and this second one should be working

Wednesday, October 17, 2012

A Box of Bits and Bobs

A box of bits and bobs that will be a 3d Printer

My recent iteration of a Prusa Mendel that made the 'box of bobs'


Well almost a year since my last post... better late than... well whatever. I've been working slowly, ploddingly, but unfortunately not documenting much because work has been so sporadic on this.

Wednesday, November 16, 2011

Extruder drive-screw

It seems there is only one way to mount the dremeled transport screw. That is with the nut in the gear. The gear it self imparts a slight twist to the filament, if the head of the screw is in the gear it's counter-clockwise. If the nut is in the large gear it is clockwise. This may seem trivial, but I found with changing the spin direction I got a more consistent extrusion flow. With counter-clockwise spin it was really inconsistent. I have to assume this is because the hole the filament goes down is slightly fluted from using a drill bit to clean the print... or from the drilling of the PEEK barrier. This still needs more testing though, I have another duplicate extruder almost setup. Maybe I can replicate the results with the other extruder.

Monday, October 24, 2011

Transport screw testing



This transport screw has been working well, much better than the other hobbed bolts I had made. This way of making the drive screw is a lot more consistent and quicker to make.  I'm making a cut area of about 22mm, this way the bolt can be put in either direction, with the head in the gear, or the nut in the screw. The head in the gear seems like it makes more sense to me... I tried a cut area of 20mm, this works, but when I added two washers just behind the large gear a small amount of uncut threading could be seen in the idler wheel hole, 22mm seems to be just right.