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Re: Replicape + BBB - 5 years ago
I proposed 100€ to rshane, so the same for you. But I first need to know if rshane is still interested... If he is not, I can sell it to you.by fma - For Sale
Re: X axis orientation - 5 years ago
I already built the printer, with the vertical design. All the rods and linear bearings are from an old Stratasys, and are very good (16mm rods, INA auto-centering bearings...). Why a single guide is better? I guess it can suffer from the same issues, depending of the quality... And position of belts can have the same effects...by fma - CoreXY Machines
Re: X axis orientation - 5 years ago
And with an horizontal design, with belts in the same plane, is it better to have them close together, fixed at the center on each side of the carriage, or to move them apart, each belt close to the rod? With belts at the center, they won't induce twist on the carriage even if there is a mis-tensioning. On the other hand, the carriage will more able to twist under vibrations...by fma - CoreXY Machines
Re: Replicape + BBB - 5 years ago
Yes, it works fine. I will give you the shipping cost.by fma - For Sale
Re: X axis orientation - 5 years ago
I dig this old post, which never had an answer. My current CoreXY design uses a vertical X axis config: but I'm thinking to switch to an horizontal config: (Righ now, the vertical carriage only uses 2 linear balls bearings, because I was missing the 2 others. I now bough them, so I can re-design it.) I'm wondering which config has the better rigidity when the carriage is shaking during prby fma - CoreXY Machines
Re: Diamond hotends heatsink - 5 years ago
Quotefrankvdh Various people have been working on ink-based colouring systems for quite a while, I think mostly focused on inkjet technology. A soon-to-be-released example is Interesting! I also found this: [3dprint.com] QuoteGetting back closer to the Diamond approach, I wonder about an "asymmetric" hot-end. Have one large (e.g. 3mm?) base-colour filament, and several smaller (1.75mm? or maby fma - General
Re: Diamond hotends heatsink - 5 years ago
Thanks for the precisions about Diamond 5... That's said, I'm still not convinced what you guys are explaining about the heatsink keeping the PTFE cold. The Lite6 heatsink is heated up by the heatblock. Right? The fan tends to keep it not too much hot, so it does not itself heat up the PTFE (so the filament). Am I still right? But the base of the heatsink is much more hot that the ambiant air.by fma - General
Re: Diamond hotends heatsink - 5 years ago
I guess they keep their technology away from public eyes What is very strange is the very long path in the heater block. On the other hand, the fan blows directly on the filament, just before it enters in the tube. So the cold/hot transition is not that long. I tried this solution (without the curve), but I think my stainless steel tube was not smooth enough inside, and I had a lot of frictionby fma - General
Re: Belt(s) tensioning - 5 years ago
So, you advice to tighten the idler wheel after tensioning? Or can I let it free to turn?by fma - CoreXY Machines
Re: Diamond hotends heatsink - 5 years ago
I used for years a GRRF hotend using a PEEK heatsink (with PTFE, pretty close to the Lite6 design), without any active cooling. It was a problem to mount it, because the PEEK got very hot, but it was working fine. I had no issue (but I was not in a Bowden config). About the E3D clip, I'm talking about this: With such clip, the PTFE would not be heated up on a too long path... BTW, have you eby fma - General
Re: Diamond hotends heatsink - 5 years ago
I made some tests yesterday: not an epic fail, but not an epic success neither. The problem is the length of the metal pushfit I'm using: it maintains the PTFE hot on a too long distance. So, retractation sucks, as it was mentioned. I'm waiting for new connectors ('à olive', in french. Union?), but I'm not sure they will be better. Best would be something similar to E3D system, but with metal clby fma - General
Re: Belt(s) tensioning - 5 years ago
You mean the PTFE? I cut it so the belts can't touch each other. If it was shorter, it would be the case. But this is a very flexible sheet (1mm thick), so it follows the belts, and not the opposite. The only point where it can't move is inside the holding part. I think it could be possible to maintain it in a better way, so it is totally free and does not act on the belts at all. I'm thinkingby fma - CoreXY Machines
Re: Belt(s) tensioning - 5 years ago
Not sure to understand what you mean... The PTFE is maintained in its middle by the purple hanger, and positioned at the exact blet crossing; and the belts themselves keep it twisted. The PTFE is flexible enough even at the fixating point so it does not push the belts. Even if the belts where deflected, as they are always in the same position, this should have no influence on the carriage? Am Iby fma - CoreXY Machines
Re: Belt(s) tensioning - 5 years ago
SydneyDesigner, I implemented your suggestion: The 'V' on the left auto-blocks the belts, and the part where it is engaged is used to put tension on the belts. It allows a good tension within a small space. I printed a prototype, and it works great. As I used a single plane config, I cut a part in a PTFE sheet to put between the belts where they cross, which avoids friction: Here is how thby fma - CoreXY Machines
Re: Diamond hotends heatsink - 5 years ago
I just made this: Stainless steel screws, alu heatsink... I should receive my metal pushfits on tuesday.by fma - General
Re: Diamond hotends heatsink - 5 years ago
Arrgl, the test failed. Not because of the hotend itself, but because of the PLA mount. This mount prevents the natural air flow I had when I tested the hotend in the air, so now, the top of the hotend becomes too hot for the PLA... I could print with some filament having a higher Tg, but I think it is better to build a new heater block, as I suggested, to address the 2 problems: mount temp. andby fma - General
Re: Diamond hotends heatsink - 5 years ago
Quotejinxthe E3D team came up with the V6 lite to counteract the influx of clones on the market, and to give us budget builders/PLA users an affordable option for a genuine e3d hotend. Yes, true. QuoteFMA what was the test print ? was there a lot of retraction and at what speed, am just thinking that if fila allowed to heat up through the tube then the fila becomes elastic resulting in a slugby fma - General
Re: Diamond hotends heatsink - 5 years ago
QuotefrankvdhThe conservative part of me says that all the Reprappers who have gone before believed that they needed the heatsink -- they wouldn't have put it on otherwise. The other part of me says that maybe they were all wrong. The E3Dv6 came first. This design, which can reach high temp, does need the heatsink, to cool down the heatbreak, and keep the PTFE cool. Then came the Lite6. My feeliby fma - General
Re: Diamond hotends heatsink - 5 years ago
I didn't find stuff to insulate the Lite6. But after 2 hours running at 210°C, the top part of the heatsink (groove mount?) was still cold! So, I will re-designed a support without all the fan duct, in order to print real things (the above test was just extrusion in the air), and see if the print remains correct. I also ordered these connectors: . I will drill a custom heater block, with a metalby fma - General
Re: Diamond hotends heatsink - 5 years ago
QuoteUsing a PTFE liner reduces this friction and insulates the filament from the heat that does pass through the heatbreak So, the heatsinkbreak tends to heat up the filament, not to cool it down! That's exactly what I said before. So, removing the heatsinkbreak, and have fresh air on the PTFE can only improve things. Ok, I launched the test without fan on the heatsink: so far (almost an hourby fma - General
Re: Diamond hotends heatsink - 5 years ago
No, the Lite6 does not have heatbreak! Your are describing the E3Dv6 standard... The Lite6 heatsink is screwed directly on the heat block, and touches the nozzle. Then, the PTFE tube goes down to the nozzle too. I own a Lite6, so I'm sure of that. That's why the Lite6 is limited to 250°C, where the E3Dv6 can go up to 300°C or more, because the PTFE never reaches that temperature, thanks to tby fma - General
Re: Diamond hotends heatsink - 5 years ago
You say that heatsink conducts much better than the air. I agree. So, it is also directly heated by the nozzle, because of the direct contact with it! Plus, PTFE is a good thermal insulator; so how can the heatsink cool down the filament? Don't forget that I'm talking about the Lite6 version, where there is no heatbreak inside the heatsink... and this Diamond version works fine. Look at this hotby fma - General
Re: Diamond hotends heatsink - 5 years ago
About the heatstink and mount, I'm thinking to something very simple, with screws and large washers...by fma - General
Re: Diamond hotends heatsink - 5 years ago
As the heatsink arround PTFE is hotter than ambiant air, I don't see how it can cool down the filament better than ambiant air...by fma - General
Diamond hotends heatsink - 5 years ago
Hi! I plan to use a Diamond hotend (3 or 5 colors) in Lite6 config. I'm wondering: are 3 (5) heatsinks really needed ? As PTFE tubing goes to the Diamond, what about making a custom heatsink (don't know yet how), in order to attach the Diamond on the carriage, and put the (all metal) pushfits directly on the Diamond? Thanks,by fma - General