Tomas's Kossel XL build log
Posted by tomasf
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Re: Tomas's Kossel XL build log November 29, 2016 05:33AM |
I finally ordered the remaining parts, and the Duet Wifi and IR sensor arrived last week. I replaced the temporary 0.8.5 board and everything went smoothly. The linear rails were estimated to arrive a few days ago, but have yet to appear. In the meantime, I mounted an old set of shorter (400 mm) rails that I already have, so I can at least get the machine up and running with a limited build height. The endstops are now mounted 300 mm from the top of the frame, which looks silly, but works.
The pushfit connector arrived from the states, so I can finally use my hotend. I had some problem with jamming, probably because I mounted the print cooling fan too close to the back of the heatsink, preventing airflow.
I increased the angle of the mounted part cooling fan to let more air through behind it, and I haven't had a jam since. The first thing I printed was a benchy in white PLA, and I'm very happy with the result. Not bad for a first print without any tuning beyond the probe Z offset.
The extruder is more noisy than the one on my old machine, which is of the exact same model. Not sure why yet.
The pushfit connector arrived from the states, so I can finally use my hotend. I had some problem with jamming, probably because I mounted the print cooling fan too close to the back of the heatsink, preventing airflow.
I increased the angle of the mounted part cooling fan to let more air through behind it, and I haven't had a jam since. The first thing I printed was a benchy in white PLA, and I'm very happy with the result. Not bad for a first print without any tuning beyond the probe Z offset.
The extruder is more noisy than the one on my old machine, which is of the exact same model. Not sure why yet.
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Re: Tomas's Kossel XL build log April 04, 2017 09:10AM |
I'm now in the process of re-thinking the extruder/hotend setup. I have an early bird Zesty Nimble on order, which hopefully ships reasonably soon. I've also decided to take the opportunity to replace the DyzEnd-X with the 1730 hotend, which is so much better.
While the DyzEnd-X doesn't jam as often as it used to, it's still not great. It leaked quite a lot in the beginning for a "leak-free" hotend. Sure, if you tighten the nozzle repeatedly and do everything perfectly, I'm sure it doesn't leak, but with those criteria, any hotend could be considered leak-free. Meanwhile, the 1730 hotend literally can't leak, because the nozzle and the guiding tube is a single part (FNU). It also has a significantly more quiet fan, perhaps in part because it's a bit larger.
The combination of the Nimble and 1730 should be really sweet. The FNU shaft goes right up to the Nimble, so no intermediary PTFE tube is needed at all. I've made top/bottom mount prototypes for this combo (and dc42's IR sensor), and it seems very promising. Here's a photo of the mounts, together with mockups of the Nimble, hotend and a Kossel effector modified to match the thickness and hole layout of the Robotdigg effector:
I've ordered a 1730, which arrives tomorrow. Fingers crossed the mount fits!
While the DyzEnd-X doesn't jam as often as it used to, it's still not great. It leaked quite a lot in the beginning for a "leak-free" hotend. Sure, if you tighten the nozzle repeatedly and do everything perfectly, I'm sure it doesn't leak, but with those criteria, any hotend could be considered leak-free. Meanwhile, the 1730 hotend literally can't leak, because the nozzle and the guiding tube is a single part (FNU). It also has a significantly more quiet fan, perhaps in part because it's a bit larger.
The combination of the Nimble and 1730 should be really sweet. The FNU shaft goes right up to the Nimble, so no intermediary PTFE tube is needed at all. I've made top/bottom mount prototypes for this combo (and dc42's IR sensor), and it seems very promising. Here's a photo of the mounts, together with mockups of the Nimble, hotend and a Kossel effector modified to match the thickness and hole layout of the Robotdigg effector:
I've ordered a 1730, which arrives tomorrow. Fingers crossed the mount fits!
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Re: Tomas's Kossel XL build log April 05, 2017 05:36AM |
The 1730 arrived today, and it fits. I needed to fine-tune the Z offset of the IR sensor, but that's it. They've added a red metal cover to the fan, which wasn't present in my previous Kickstarted unit. This is most likely to prevent overtightened bolts from cracking the fan plastic.
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Re: Tomas's Kossel XL build log May 18, 2017 03:08PM |
A few days ago, my Nimble finally arrived! I'm apparently the first customer to receive it. The adapter I designed and prototyped using the mock Nimble model actually fit the real thing. I later had to adjust the adapter slightly to avoid Nimble touching my delta rods.
Nimble looks solid, with a nice grainy surface finish. The breech block was in a darker red color than I expected from the photos. Assembling it was fairly easy. The strands of the drive cable kept flaring, so sliding it into the worm gear was tricky. Cutting a few of the problematic strands and re-shaping the cable end into a square helped. No biggie.
I also installed the 1730 hotend I received previously. I had some problems pushing filament through easily, but some thermal paste on the FNU fixed it.
The new setup works very well. Nimble is a joy to use. It pretty much just works. After adjusting steps per mm, acceleration, jerk and retraction settings, everything works as expected. It's fantastic to finally get rid of the bowden tube.
Almost two years ago, I bought a roll of flexible TPE filament. The printer I used back then was crap, and I've only used bowden machines since, so the filament has been sitting unused in a drawer. Yesterday, I tried printing a hollow vase with it, and Nimble handled it beautifully.
Nimble looks solid, with a nice grainy surface finish. The breech block was in a darker red color than I expected from the photos. Assembling it was fairly easy. The strands of the drive cable kept flaring, so sliding it into the worm gear was tricky. Cutting a few of the problematic strands and re-shaping the cable end into a square helped. No biggie.
I also installed the 1730 hotend I received previously. I had some problems pushing filament through easily, but some thermal paste on the FNU fixed it.
The new setup works very well. Nimble is a joy to use. It pretty much just works. After adjusting steps per mm, acceleration, jerk and retraction settings, everything works as expected. It's fantastic to finally get rid of the bowden tube.
Almost two years ago, I bought a roll of flexible TPE filament. The printer I used back then was crap, and I've only used bowden machines since, so the filament has been sitting unused in a drawer. Yesterday, I tried printing a hollow vase with it, and Nimble handled it beautifully.
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