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Double Whammy Prusa
by chowderhead, published
The Double Whammy prints parts twice as fast because there are two extruders working simultaneously!
The machine is intended for production, producing two copies of the same print at once. Built using my Push-me-pull-you extruder drive (http://www.thingiverse.com/thing:46800) and a pair of Acarius10's Minimalistic J Head X Carriage (http://www.thingiverse.com/thing:45883) fitted with a pair of 0.35mm J-head hotends (https://www.hotends.com/index.php?route=product/product&product_id=88). I think the hobbed bolt came from lulzbot (http://www.lulzbot.com/?q=products/hobbed-bolt-stainless-steel); the hob is 29mm from the cap (stl included).
There is still some tweaking to be done (does it ever stop with these things?) but it seems to be working well.
03.09.13 - have had a lot of trouble with the FEP tubing blowing out of the drive-end nuts. Trying out some PTFE tubing now. Will update after a few hours of printing. With the exception of the sheath failure and sore thumbs from loading filament into the push-me-pull-you, it has been working excellently. The extruder is quiet as can be...
02.14.13 - uploaded micrograph of a pulley I printed on the DWP last night - pretty sweet if I say so myself! What has proven to be very nice is the ability to slow print speed down to improve print quality while still making parts at a much higher rate than before. I had some trouble with stripping PLA and plugging up the hobs with the idlers having only 1mm at-rest spring stretch and replaced them with idlers having 4mm stretch - seems much better.
Follow the instructions for the various bits.
The Bowden cable sheath is 2mm x 4mm FEP tubing.
Space the x-carriages at about 100mm on the x-axis.
Slice the parts with the x-axis size set at 100mm so that the print is properly centered in each print area.
I tried media from two different suppliers at the same time and was unable to complete the print. Even different colors seem to behave differently. Suggest that to minimize catastrophes, use the exact same material in both sides of the extruder.
Drink something yummy while your printer produces at twice the rate it ever did before.