I was about to print something today and decided to compare printing it with the A1 vs the H2D, because surely my H2D will be at least a little bit faster. But in the slicer, I’m seeing the H2D come in at 40 minutes longer to print - 24% longer than the A1.
Both are using PETG, 0.4mm nozzle, 0.20 Standard profile. I went over the settings of the profiles and they are mostly the same, except the H2D has a few settings which in theory should make it faster.
I must be missing something here?
Why? Which are the settings making it faster?
Let’s just ignore that comment, it was merely a belief - backed by no evidence. I thought I had read it somewhere, but maybe it had only been related to multi-color prints.
However, it being slower than the A1 is still surprising. I’d expect it to be the same or within a few percent. 24% slower is surprising given it has the same print settings.
its simply because the toolhead is much heavier than the toolhead of the A1 i think…
I just tried slicing the same part for the A1 and H2D and the H2D was actually slightly faster. With the 0.2mm standard profile the H2D actually has more aggressive acceleration and speed, so maybe in your case it’s a bug in the slicer?
I’ve noticed on the slicer some things are faster some are slower. People say it’s to be expected because the toolhead is bigger heavier.
This was also my first feeling after I upgraded from my X1C! But you must be careful when comparing the profiles.
While printing, switch to sport and then ludicrous mode. See if it still looks good and adjust slicer speeds after.
Your toolhead has more distance to travel and is heavier.
This is a known “issue”, and it is expected. The tool head is much heavier.
The default printing profiles are also considerably slower, likely for the same reason. You’d need to tune them appropriately to find out the limits. Bambú default settings are conservative
It is NOT a heavier printhead. There are slicer setting’s and issues we have seen. They need to update slicer .12 had big time changes .16 was the same as p1s and h2d .20 the same. If it was weight it would affect proportionally across all settings
They do not have the same settings. Narrow thin tall object probably means longer layer time, which it does have a longer time per layer. You can also look at the speed setting to see what speeds are actually being used, as you can see it is using a slower speed.
I can’t post images or links, so… you just have to find it yourself under settings. Thanks bambu!
Right now I’m basing the speed comparison entirely on the estimate from the slicer, not necessarily the real-world experienced speed (I didn’t need two of this part).
Distance to travel doesn’t make much sense, once the toolhead is in the right place, it’s distance to travel would be the same (within a few percent) as any other printer for the same part. As shown in the original screenshot, the Travel time is actually much faster on the H2D than the A1, it’s the walls/infill that take a lot longer.
The weight of the toolhead shouldn’t matter? I mean, I can see how maybe it could matter - but then I’d expect the H2D profile to be tuned to have slower speeds.
I’m running the latest release of Bambu Studio, Version 2.0.3.54.
For reference here again are the slicer’s time/filament usage estimates (from my original screenshot).
A1:
H2D:
We see here that walls and infill are a lot slower on the H2D, but travel time is much faster on it (or better said, less time is spent on it). The A1 burns 31% of it’s time on Travel, the H2D only 13%.
Looking at the profiles for each of them, these were the differences:
| H2D | A1 | |
|---|---|---|
| Sparse Infill Speed | 350 mm/s | 270 mm/s |
| Travel Speed | 1000 mm/s | 700 mm/s |
| Normal Printing Accel. | 8000 mm/s² | 6000 mm/s² |
| Elephant Foot Comp. | 0.15 mm | 0.075 mm |
| H2D | A1 | |
|---|---|---|
| Elephant Foot Compensation | 0.15 mm | 0.075 mm |
| H2D | A1 | |
|---|---|---|
| Smooth Coefficient | 4 | 80 |
Everything else — including wall setup, shell configuration, infill type/density, prime tower, flush settings, line widths , seam options , precision (except elephant foot) , ironing , and wall generator — is identical between the two profiles.
I’m glad that they changed the smooth coefficient to a lower value, would be pretty helpful for overhang corners.
Would you just raise all of the speed settings by the same percentage?
If you could upload the 3mf or link to the model you are trying to print, we can take a better look at whats going on.
Sure, here you go.
This is this model, but I tweaked it in Bambu Studio to adjust the size.
cable_pass_through-EXAMPLE.3mf (897.1 KB)
What are the size changes? The 3mf link does not work.
The problem is with PETG HF mainly as with PLA Basic its faster on H2D. This comes down to higher hot end temp (for faster printing) + longer layer time (for better quality), left is H2D right is A1.
What you can do is tick off “slow down for better layer cooling” on the PETG HF filament profile, and you will get faster print speed on H2D compared to A1. You will have to test to see if the quality suffers.
This is mainly due to the thin wall tall item, if it was a bigger print you would not run into this issue.
I personally would print it with the stock settings, but this gives you an insight to what is going on. Hope this answers you question.
TLDR: H2D is optimized to print fast but with good quality. On some specific prints (thin walls with PETG HF) it will be slower, but overall should be faster with better quality walls.
Good digging here, it’s appreciated. It was mostly curiosity. Anyone following along at home, ticking this off changes the print time from 3h26m to 1h51m.
The problem is with PETG HF mainly as with PLA Basic its faster on H2D
I wasn’t expecting such a big change between PETG and PLA too.
I personally would print it with the stock settings, but this gives you an insight to what is going on. Hope this answers you question.
Agreed. Thanks again, learned some new things today.
