Written by Jesus Lerma | 3DREANIMATION LLC
Overview
After more than 100 hours of printing with the SainSmart WonderMaker ZR, the machine has proven to be a capable and well-designed platform overall. The printer demonstrates excellent mechanical performance, accurate homing behavior, and solid build quality. However, during extended use, two reliability issues became apparent primarily related to color swap operations and pause behavior. Addressing these areas would significantly improve the overall user experience and reliability.
Key Observations
1. Filament Change Reliability
The printer occasionally encounters issues during filament color swaps. The primary cause appears to be the filament cutting mechanism. Currently, the cutting blade trims the filament at a 90-degree angle, which can leave a flat filament tip. During subsequent loading, this flat edge can catch on an internal ledge or obstruction within the toolhead, causing intermittent loading failures.
2. Heated Bed Behavior During Pause
Another issue occurs when the printer enters a paused state. During a pause, the printer’s configuration triggers a timeout routine that disables all heaters, including the heated bed. When the bed temperature drops, prints can cool and detach from the build surface, potentially ruining long prints.
Suggested Improvements
1. Improve Filament Cutting Geometry
To improve filament loading reliability, the filament cutting mechanism could be adjusted to cut at approximately a 45-degree angle instead of 90 degrees. A beveled filament tip would guide the filament more smoothly into the toolhead and reduce the chance of it catching internally.
Alternatively, implementing a retry sequence during filament loading would also improve reliability. If the printer detects that filament loading has failed, the system could automatically retry the load process up to 1–5 times before reporting an error.
2. Pause Macro Heater Behavior
The current pause macro invokes the printer’s idle timeout logic, which ultimately calls a routine containing: TURN_OFF_ALL_HEATERS
This results in the heated bed shutting down during a paused print. The issue appears to originate from the following line within the PAUSE macro configuration:
SET_IDLE_TIMEOUT TIMEOUT={printer.configfile.settings.idle_timeout.timeout}
A simple improvement would be to replace this line with a direct timeout value such as:
SET_IDLE_TIMEOUT TIMEOUT=43200
Setting a long timeout (for example, 12 hours) prevents the idle timeout routine from triggering while the print is paused, allowing the heated bed to remain active and preserving bed adhesion.
Conclusion
Overall, the WonderMaker ZR is an excellent machine with strong mechanical design and reliable core printing performance. Homing accuracy, motion control, and general print quality have been outstanding throughout extended use.
The two issues described above—filament swap reliability and pause-related heater shutdown—are relatively minor and appear to be largely software or configuration related. Addressing these items would significantly improve reliability, particularly for multi-color prints and long-duration jobs.
Having logged over 100 hours of printing, these were the only notable problems encountered. With small improvements to the pause macro behavior and filament loading reliability, the WonderMaker ZR could become an even more robust and dependable platform.
I wanted to follow up and give you a clear overview of the projects I’ve been working on with the machine and my overall experience so far.
Initially, I used the machine for a mix of personalized figurine projects and general calibration work. I printed many Benchy boats and all-in-one calibration towers. As I continued testing, I started running into issues related to the pause macro. However, when the WonderMaker ZR is functioning as intended, it truly feels like a “click and print” system.
Once these macro issues are resolved, I am confident that this machine will significantly increase my productivity. It’s a great machine that just needs some quick fixes. With the retry function for loading, this machine will be a 10/10.
