Tento článek je také dostupný v následujících jazycích:
V tomto návodu se dozvíte, jak pomocí vlastního modelu vygenerovat objekt pro kalibraci resinu. Doporučujeme tento přístup pouze zkušeným uživatelům.. Předpřipravený kalibrační objekt resinu by měl posloužit většině uživatelů, ale mohou existovat některé specifické modely, které sami dobře znáte nebo které mají funkce a geometrii speciální pro vaši aplikaci.
Vezměte prosím na vědomí, že pro Original Prusa SL1S SPEED byla tato funkce byla kompletně přepracována a v současné době je k dispozici od firmwaru 1.7.0-beta.4! Tato verze je určena zkušeným uživatelům. Finální firmware bude brzy vydán.
Soubory .sl1/.sl1s- pro vaši resinovou tiskárnu Original Prusa jsou ekvivalentem souborů G-code pro tiskárny typu FFF, ale jsou trochu odlišné. Soubory pro Original Prusa SL1 nebo SL1S SPEED (.sl1/.sl1s) jsou archivy podobné zip souborům s řadou obrázků. (.png) pro každou vrstvu tisku, kromě konfiguračního souboru. (.ini). Po slicování je pro vytvoření kalibračního objektu třeba upravit především konfigurační soubor. O zbytek se postará tiskárna.
Výběr modelu
Číslo a velikost
Při výběru kalibračního objektu je třeba zvážit dvě hlavní skutečnosti: Velikost objektu a počet objektů na desce. Systém nebude znát velikost objektu, takže pokud vyberete něco příliš velkého, může se stát, že bude oříznut nebo se na desku vůbec nevejde. Můžete to vyzkoušet tak, že vytvoříte více instancí a zjistíte, kolik jich bude na tiskové platformě (maximálně 9). Ve finálním projektu však musíte mít pouze jednu instanci. Zbytek vygeneruje tiskárna.
Examples of how many instances will fit on the plate. In this case, 4 instances.
Geometrie
Doporučujeme model bez extrémních převisů, které vyžadují podpěry. To vám ušetří spoustu času. Objekty mohou zcela selhat, což musíte před dalším spuštěním kalibrace odstranit. Se "zátěžovými testy" tiskárny byste měli experimentovat později. Jde pouze o nalezení optimální doby expozice v obecných geometriích. V této příručce bude použita verze testovacího objektu Original Prusa SLA, který je mírně upraven, aby měl menší rozměry. Můžete si ho stáhnout z Printables.com.
Vytvoření souboru projektu
Otevřete PrusaSlicer a vyberte, pro kterou tiskárnu budete kalibrovat (SL1 nebo SL1S).
Přidejte model do aplikace PrusaSlicer a vycentrujte jej pomocí nástroje Auto-arrange (modrá šipka). Vytvořte pouze jednu instanci!
As Resin type select Prusament Resin Tough Prusa Orange, at 0.05 Normal as SLA print setting (green square). This is a good starting point for Tough resins.
Use no supports or pad (purple square).
If you are calibrating for another type of resin than Tough, i.e. Flexible or high-tenacity resin, it may be better to start with an existing preset for this type of resin. Exposure time can also be adjusted on the printer itself when you later start the print.
The printer will generate a label showing the exposure time. This is always placed to the right of the model.You may have to rotate the model to make them all fit on the plate.
Slice and Export your SL1/SL1S project file.
Copy the exported file onto a USB drive or uploaded through PrusaLink to print the project.
Modifying the project file
A program like 7zip is open-source and will automatically recognize the project as an archive. Right-click the file and you are provided the option to "Extract" the content to a folder. If you do not want 7zip installed, change the file name ending from ".sl1" to ".zip" and any archiving application will recognize it.
Make sure you have enabled showing file extensions in the file name. Under Windows 10 this is done by a check-box found under the View-tab in File Explorer.
You will now have a folder with a lot of images and two configuration files. You need to open edit "config.ini" in Notepad, Brackets, or any other plain-text editor. Just ignore "PrusaSlicer.ini".
After the last line ("usedMaterial = ***"), paste the three lines of code found below for your printer. It is important that you use values compatible with your printer model (SL1 or SL1S SPEED) due to their very different average length of exposure.
Explanation of parameters:
calibrateRegions represents the number of objects on the print plate. For this model, it is set to 4, due to the size of the object. You can change this but only use the numbers 2 4 6 8 9, depending on the size.
calibrateTime is the time increment in seconds per object. Can be adjusted to 1 decimal place (0.1s)
calibratePadThickness is the thickness in millimeters of the label generated for exposure time.
calibrateTextThickness is the height in millimeters of the text on the label.
Suggested values for a tough resin on each printer version.
Make sure you have the configuration as in the picture below and save (ctrl/cmd+S) the config.ini file and close your text editor.
*Default configuration values.
Select all files in the folder (ctrl/cmd+a), right-click and create an archive (.zip file) of the content.
Do not create the .zip file by simply right-clicking the folder. This will create an archive with a folder, not a series of files, which is incompatible.
Change the ending of this Zip file to ".sl1" or ".sl1s", depending on your printer model. Windows will warn you you may make the file unusable, and ask if you wish to continue. Click Yes.
Copy your newly made SL1 Resin Calibration object to a USB stick and you are ready to run the file on your printer.
Starting the print
When selecting the project, swipe left to confirm your print settings.
Within Print settings, you can edit the values of some parameters you pasted in the previous steps. Verify they are as you need them and tap 'Back' in the top-left corner.
Settings for SL1S SPEED. These values will NOT be compatible with SL1.
Start your print and let it finish. You will see the printer has created more instances of the object and added a label stating the total layer exposure duration per instance.
During printing, you can swipe right to see the mask of the current layer.
Assessing the results
Assessing the results will depend on the geometry, but there are some general rules you can follow: The geometry of prints will grow with exposure time. In practice, this means that if you have missing details you must increase exposure duration. Vice versa, if elements, like thin holes, are filled completely you should reduce the exposure.
An example of how geometry forms can be found in the pre-made calibration object's glasses, where the actual glass within the frame will not be printed if exposure duration is set too low.
This can be observed where different geometry meets/makes contact as well. Say you have two arrows pointing to each other, touching at the very tip; With insufficient exposure, the tips will not touch. Oppositely, with too long exposure, the point of contact will not be a single point, but rather the two arrow tips will slightly merge together.
How objects are arranged
The printer will automatically take the unmasked area of the print and copy it as many times as is set in the config file (calibrateRegions). It is a basic copy/paste, following strict rules, meaning it will not rotate or arrange objects. With anything more than 2 objects it will place them in a grid pattern.
Regions
Grid size
Max. X/Y object size SL1S SPEED
Max. X/Y object size SL1
4
2x2
63 mm x 40 mm
60 mm x 34 mm
6
3x2
42 mm x 40 mm
40 mm x 34 mm
8
4x2
31 mm x 40 mm
30 mm x 34 mm
9
3x3
42 mm x 26 mm
40 mm x 22 mm
* Values are rounded down. Considerations for non-uniform/symmetric/extreme geometries must be applied. Note that for each object there is a tag (5x10 mm) connected to it. This affects the maximum object size.
If orientation or size is not right
With four regions it will always put them two by two. Therefore, the size and orientation of the model can affect whether everything will fit on the plate, or will be cropped by being outside of the platform.
It will not consider the total area of the object and place them all in a row, if that is how it would fit, like PrusaSlicer does.
Creating a PrusaSlicer preset
Did you find the best exposure time for your resin? Great! You can start a normal print right away, adjusting the exposure time on the printer's display before the print or you can create your own resin profile:
Open PrusaSlicer and in the Plater view, select from the list of the printers (green arrow), Original Prusa SL1/SL1S SPEED, depending on which you have.
From SLA print settings (purple arrow), select the layer height you want to calibrate the resin for. This will load all the available resins.
Click on the "Material settings" tab on top.
Select any resin from the dropdown list with the layer height you intend to calibrate for. It will be used as a base for your new profile. Then click on the "Save" icon (💾) next to the list (blue arrow).
A dialogue will open up where you name the preset (e.g. "My new calibrated resin") and hit "OK".
In the new resin, the profile adjusts the fields "Initial Exposure time" and "Exposure time" (red square), which sets the time for which each layer of the sliced object is exposed to the UV light.
Now, you are good to go. Slice your next model and Happy Printing!
Byl tento článek užitečný?
Komentáře
Stále nemáte jasno?
Pokud nemůžete najít odpověď na vaši otázku, projděte si naše další materiály na webu. A pokud nenajdete odpověď, pošlete nám zprávu na [email protected] nebo přes tlačítko níže.