Prusa dun good with this surprise update.
Modified MINI: Revo hotend + Bondtech extruder
Side notes (will add more as I test this firmware):
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The pre-sliced benchy from Prusa is a bit of a hack. While it does showcase the new speeds, you are not going to get the best performance when you slice it in Prusa Slicer. The new printer profile is good, but it is absolutely in alpha. (I amended a comment below where I was moving all settings to max.)
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Factory Prusa profile for IS, only uses 0.4mm nozzles (I have been using 0.6mm nozzles exclusively for a while now)
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If your belts are still stock, order new ones now. The stress that is getting put on the belts now is a little more extreme. (FYI: There was an error in the F1 x-gantry stop where it might wear the belt excessively, so look close.)
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I have properly packed all the bearings in the printer with grease so they are not as noisy as they would be stock. Be prepared for bearing noise, is what I am saying.
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Faster printing is causing ~-2°C drift on my REVO nozzle. That is expected and might be able to PID tune for better stability. It's not bad, just something of note.
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"BonkersBenchy" was sliced with Prusa 2.6.2a. and accelerations are set at 8000mm/s^2. There are other subtle changes in the gcode that affect total print speeds, so dig into them if you need mor fasts.
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The printer compensates OK when the print speed is manually set to 255 (absolute max). Your top layer bridges are going to have a rough time. It may work or, your print will be ripped off the bed because the first top layers aren't exactly studio quality. (I should say it adjusts to max speed better than it did with older firmware.)
I installed and have been testing the new firmware with great results. I was a little disappointed that the bonkers benchy kind of cheated by using 5% infill, single exterior walls, and less top/bottom layers, but it was super satisfying watching the print head whip around. I need to refresh the bearings before I print too much else.
Yeah, it was a little bit of a hack, but it’s just a benchy after all. You can mostly replicate those speeds, but not quite. Prusa mostly used three different static print speeds, with travel moves all being at max.
At least ya’ can’t say I didn’t warn people about the bearing noise. It shook the hell of of mine. ;)
I’m wondering, how are you dialing in customized, (in your case hot-end and extruder) printers with input shaping?
Is it something working for any device and any combination of parts, if the computational part supports it?
It’s all factory settings in this case. I am running my own print now with the new Prusa Slicer 2.6.1 profile. So, nothing is dialed in yet. (Edit: I am using Voxel PLA Pro which can use the Prusament filament profiles.)
There are options to tweak the input shaping in the printer menu but I haven’t played with them yet.
I find it very odd that the factory sliced gcode for the benchy even worked with my printer mods. The input shaping is supposed to be for the stock MINI, but it works fine for my printer. (That boggles my mind as that breaks how I think of mechanical resonance.)
Damn. Those are some clean ass layer lines.
Yeah. For the speed it was printing at, for sure. I think it was a single wall as well.
Add a reply to this comment if you want me to test a PLA print for you before you update your own printer… (Try to keep it modest. I have lots of filament but don’t want to tie up the printer for too long.)
Slicing examples: BonkerBenchy vs Prusa Slicer (400mm/s, all speeds) test:
