H2D - Bugs and Issues - Bambu Lab

[3DTech]

I do like the printer, but it has a few bumps along the way that need to be addressed. Perhaps next time, they could send some printers to people on the Bambu lab forum so these bugs and issues can be identified early on.

My List of H2D Bugs and Issues:

When performing dual nozzle printing with high-temperature filament and support interface layers, the first layer applied on the last interface layer often suffers from excessive cooling due to the fan turning on at higher speed for overhangs. This results in a weakened layer. To fix this issue, I can reduce the fan speed for overhangs to lower setting, but this adjustment sacrifices the overhang cooling speed for other layers that require a higher fan setting.

80% fan speed for overhangs:

30% fan speed for overhangs:

Solution we need more fan control options added to Bambu Studio with dual nozzle printing.

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Nozzle Temp Bug:

I’ve occasionally noticed though not consistently that when switching nozzles using the OEM G-code, the nozzle sometimes remains at 250°C after the purge. It doesn’t change to the higher temperature specified in the filament settings, which in my case is 275°C good thing I saw it before it caused a part failure or damaged the printer.

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Right Nozzles Pruges to much:

Solution Bambu Lab is actively addressing this issue.

I’ve been using custom G-code for purging, so I haven’t tested if firmware 08 to see whether it has made a difference or not.

If it’s still happening, the next slicer update should fix it.

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Misaligned rear Z rod prevents the print bed from rising.

I haven’t encountered this issue myself, but it needs to be resolved as soon as possible. I’m sharing this here to help others find the fix.

The Fix Steps

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Chamber Temp Logic:

If you have a filament that requires a chamber temperature of 50°C but a bed temperature of 110°C, and when the chamber reaches 55°C, it triggers a warning to open the door to cool it down, the workaround is to set the chamber to 55°C. However, this results in the heater turning on at times when it’s not actually necessary.

Solution: The chamber temperature is set to a sample of 50°C, with an adjustable maximum temperature limit, such as 60°C. If the temperature exceeds this limit, the printer will issue a hot chamber warning message.

I will need to test this again after firmware 08 or let me know.

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High Temperature Support Filament

Solution: Yes, you can work around the issue by using a high temperature filament like ASA, but this isn’t a beginner friendly way.

Sample
HT-BW (High-Temperature Breakaway)

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Z Hop:

Add an option in Bambu Studio to enable Z-hop exclusively on the top surface, bottom surface, or both.

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Bambu Links

H2D

HMS Code Index

AMS 2 Pro

AMS HT

Technical Ticket

If you come across any other problems, feel free to add them to this post your input could help Bambu Lab identify and fix the issues faster.

[3DTech]

I also posted this information in the Z band thread, but since that thread is so long, it might get overlooked so I wanted to share it here as well.

The filament I used for testing was eSun Pro PLA black @ 215c FYI.

Bambu filament fan settings you can see lines and also feel the big middle line with your fingernail. I was trying to capture the photo to highlight the big lip.

I adjusted the fan settings on this test part to eliminate the big 0.2 mm wall band that appeared in the middle. The wall thickness was scaled down from 10 mm to 4.40 mm and then to 2 mm, which caused the plastic to cool at different rates the infill was 15% rectillinear so the wall looks smooth and great now.

The lower fan settings I used in this test aren’t a universal solution for PLA or other prints, but they offer alternative cooling strategies that are worth exploring when working with PLA filament and various part designs.

[sinatra]

@3DTech

Chamber Temp Logic:

If you have a filament that requires a chamber temperature of 50°C but a bed temperature of 110°C, and when the chamber reaches 55°C, it triggers a warning to open the door to cool it down, the workaround is to set the chamber to 55°C. However, this results in the heater turning on at times when it’s not actually necessary.

Solution: The chamber temperature is set to a sample of 50°C, with an adjustable maximum temperature limit, such as 60°C. If the temperature exceeds this limit, the printer will issue a hot chamber warning message.

I will need to test this again after firmware 08 or let me know.

I agree, I only need my ASA profile to be at a minimum of 45C. On consecutive prints, with the chamber temperature already elevated, I receive a warning for no reason to cool the chamber. The logic for any heated chamber profile should be based on a minimum temperature, not a +/-2C range.