As Jebba said, apparently Slic3r doesn't like manual extrusion widths. With the extrusion widths set to 0 it generates the toolpath correctly for the hollow box. There's still some weirdness on some layers with the large hole.by crispy1 - General
Quoteor maybe finally make the switch to something else. I quite like KISSlicer, but the dev has been MIA for a couple months. Not sure if he's still working on the project.by crispy1 - General
Tried to slice MAKE's venerable Torture Test model and previewed the gcode in repetier host. I see 3 major problems in the picture. The most obvious is it's failed to correctly parse the beginning 1/3 of the box and has put paths into the middle... The second is it looks like the "thin walls are not attached to anything" bug has returned. The third is the path around the largest hole in the sby crispy1 - General
QuoteThe 1.0 does not look as clean. Your extrusion widths look like they are different.by crispy1 - General
QuoteAny idea why this geometry isn't widely used ? Some possibilities... Because until very recently good mechanical design was not a real limiting factor in 3D printer performance. Because it requires a more complex and larger frame than moving bed designs - you need a full box frame vs 2 plates (Mendel90) or a plate and some threaded rods (i3). Because (for the most part) people are very relby crispy1 - General
QuoteI've no experience of H bots, but all the designs, pictures and videos I've seen, made it looks like the components needed to be quite rigid because of the twisting forces. Perhaps this only applies to the frame. Would it be possible to have a H bot with plastic carriages and 8mm smooth rods? CoreXY does not apply any wracking (twisting) force to the crossbar during moves, so the frame anby crispy1 - General
Quotebut I'm still not sure it's any better and a conventional XY head type, ie where one motor is still on a carriage, because the Y gantry looks like a substantial bit of metal, albeit aluminium Maybe I don't understand what you mean here. But I don't see a reason the Y carriage (I call it the X crossbar assembly) has to be any heavier or larger than the one in a traditional axis layout (eg wby crispy1 - General
QuoteLooking at Ultimaker prints, there are often loads of wisps of filament, as the extruder can't stop the flow quick enough when moving from one part of the object to another. So I'm not sure that a bowden cable unit is ultimately going to give the highest speed, without some loss of quality or need to post process the print. Given my (very positive) experience with bowden extruders, I thinkby crispy1 - General
Lobo, This is interesting and I'd potentially be interested in supporting a kickstarter or indiegogo or whatever. But here's a thought for you: Why not include the stepper motors with the encoder as a single package (maybe as one of the support levels)? That way people, such as me, would not need to go hunting for appropriately strong dual shaft motors.by crispy1 - General
QuoteI don't know why there is such a fixation on stainless steel, other than it conducts heat kind of poorly... Because it conducts heat very poorly and is therefore a good material to use for the thermal break. And in order to reduce part count people combine the thermal break with other parts of the hotend, such as the upper barrel. Injection molding equipment is a poor comparison because iby crispy1 - General
Create more value than you capture.by crispy1 - General
QuoteHave you ever built a printer? If yes you should know that they don't really earn too much at the price offered. I fail to see how their profit margins are relevant to iquizzle's objections.by crispy1 - General
QuoteBut perhaps using All Metal, for a bowden setup, is counter productive, as it increases th weight of the print head (X Y Carriage) The weight difference between an all-metal and traditional PEEK/PTFE hotend is negligible. Especially compared to the mass of the stepper motor that is now stationary instead of moving around on the print head. QuoteCan you advise on where I can get a compatibby crispy1 - General
@Roger You should give bowden a try, it works very well after some basic tuning and has many advantages if you want to make a fast printer.by crispy1 - General
QuoteIf you're interested in development, you can join the fun: Had no idea this existed. Joined.by crispy1 - General
Another content aggregator site? There's plenty of those. What's compelling about yours? (What's your value-add, in other words)by crispy1 - General
I've spent the last 9 months designing a printer; one of the design goals was high speed operation without a loss of precision. I think in general, the limiting factors for many printers is poor design choices. Primarily, moving mass in the form of the bed platform and stepper motors is high. In some cases there are also issues with frame stiffness and the layout of the axes, how things are coby crispy1 - General
I've run 1.75mm filament on a bowden extruder at flow rates exceeding 150mm^3/s with a 2:1 gear reduction. I have not run into issues with the extruder limiting how fast I can print. I know other people have run similar setups at nearly 300mm^3/s with fairly conventional extruders. Based on this I think you should look at optimizing the extruder you have before trying to design some exotic duaby crispy1 - General
QuoteAlso, I assumed that a steeper internal exit angle would promote more laminar (streamlined) flow of melted plastic exiting the nozzle The Reynolds number of the melted plastic flow is extremely low, so flow will be laminar regardless of your internal geometry. A steep internal chamfer may still be beneficial in reducing the force required to pump the molten plastic through the orifice. Quby crispy1 - General
QuoteI wonder if you could at least print the timing pulleys? Unless you can print perfect circles with absolutely zero runout the answer is no. Any non-circularity in the pulleys will affect the position of the head and therefore your accuracy. Printed gears are less susceptible to this issue because there is a range of distances over which the teeth stay in mesh.by crispy1 - Tantillus
Quotea jhead needs a fan... I've never needed a fan on any of my jheads, printing both PLA and ABS over a wide range of temperatures and speeds.by crispy1 - General
@ Sanjay I was thinking the same thing but couldn't find any links at the time of my post, so I left it out. If it's true that drastically decreases the appeal of the material, given its low melting point. Sure with MBI would post some technical details on their materials, rather than just "look at this new magical mystery material!"by crispy1 - General
To those of you who know how to use Github, it's a great tool. I think the problem is it's not obvious to people unfamiliar with Git what the best way to utilize the service is (such as me). Git can also be intimidating to navigate for people who are not familiar with it, and are not familiar with the project (let me tell you about the first time I tried to locate a particular STL file in the Pby crispy1 - General
Their soluble filament is HIPS, which Ultimachine and others have carried for quite a while. Lulzbot has done dual extrusion experiments with it in the past. MBI's price for it is outrageous - Ulti sells it for roughly the same price as their ABS spools. QuoteWhen makerbot adopts this as their own idea, reprap will soon follow, right? LOL no. As usual, MBI is late to the ball game.by crispy1 - General
Those vases were released under a non-commercial license (http://www.thingiverse.com/thing:104694). At the very least you need to provide attribution to the author in your video or on your KS page. The author may ask that you not use his designs in your advertising material, or that you compensate him for their use. Another Thingiverse author recently pulled all of his designs offline becauseby crispy1 - General
By the way - you should remove those shards of plastic from between the teeth. They can cause the filament to slip and jam again. I use a regular toothbrush to brush them out. The more plastic caught in the grooves the more likely it will be to slip, so it's a self-reinforcing negative spiral of slipping.by crispy1 - Developers
Think about your hobbed gear/bolt/whatever as having a major diameter that touches the top of the teeth, and a minor diameter that touches the bottom of the valley between the teeth. IMO I think you want the filament pretty much bottomed out against the minor diameter so that the teeth are fully engaged. The actual will depend on how deep the teeth are on your hobb. One easy workaround is justby crispy1 - Developers
The z axis for large format machines is by far the trickiest part IMO. You could use scissor lifts, but remember the response (increase in height per unit input) is non-linear. You will also need vertical guide rails to constrain the gantry in X and Y, while the scissor lift only provides Z motion. It sounds like you are proposing to use the spines of the truss as the linear motion surface. Tby crispy1 - General
QuoteI still wonder why it isn't mounted as you suggested as a standard... Because someone who didn't fully understand the tolerance stack and theory behind why/how the groove mount plate was used saw an opportunity to replace a custom-machined metal (or wood) plate with 2 M3 bolts.by crispy1 - General
AFAIK arc detection is not commonly used at the moment. The problem is most likely in your speed, acceleration, and jerk settings.by crispy1 - General