3D Printed Honeycomb E-Nail Case

Open source 3d printed e-nail honeycomb case available for download.

 
Each wall, bottom and top was separately printed then glued with an epoxy. This was made with 6 separate prints using PLA plastics. Total print time was about 6 1/2 hours.

I used parts that I had from my last e-nail project over a year ago. I know there are superior components connectors (XLR), and PID controllers. However I haven't had any issues with these in over a year with thousands of hours on these components.

I shared the model files here if you wish to start printing your own. Included are the STL models for slicing and Sketchup models if you want to modify your own.

List of parts used with this particular 3d model:

• 40A SSR Solid State Relay  
• SOCKET,STD DIN,FEMALE,5PIN,PANEL MOUNT (Outlet)
• Dual Digital Display PID Temperature Controller (PID Controller)
• AC 15A/250V 20A/125V 3 Pin 2 Position ON/OFF Switch (Rocker Switch)
• Interpower 8301213 IEC 60320 C14 Power Inlet with Quick Disconnects (120VAC Power Outlet) 
• Rean NYS322 5 Pin DIN Plug

I suppose I will model different versions for different pid face plates and outlets as time goes on.

Hopefully others will modify and share their versions.

Feedback suggestions are always welcome.

Want me to modify the model for your custom PID faceplate, switch, and socket? E-Mail: anoack007 [at] gmail (dot) com


Special thanks to Reddit user /u/j4yt3x for his DIY e-nail write up.

Imperial & Metric Sliding Scale Dosage Chart

Summary

I created these charts to assist in calculating the proper dosage levels for nutrients, pesticides, cleaners, etc... The sliding scale allows you to work with the smallest (or largest) volumes of water without having to do hardly any math (or use it to double check your math).

• Top Row (X) (Liters/Gallons) - Use this row for the volume of the solution you're working with (e.g. 20L (Almost 5 Gallons) bucket).
• Side Row (Y) (Milliliters) - This is your NUTRIENT:WATER ratio.
• Middle Squares - I don't know how to explain this part. This is just like using a multiplication table. ¯\ (ツ)/¯

How to use

Lets use the dosage instructions from Nutrilife's H2O2 Oxidizer as an example.

"Use 3 mL. of H2O2 per 4 liters of reservoir water."

We know the baseline for this mixture is 3 mL. per 4 Liters (It's important to know these two numbers).

On the Metric chart below the 4 liter column find the cell that is closest to the recommended H202 mixture (3 mL.). In this case the closest value to 3.0 mL is 3.2mL, from 3.2 under 4 Liters the ratio is 1:1250. So now you know the mixture ratio for H202 is 1:1250. Using the 1:1250 row as a sliding scale you can select any column for your solution and add what is suggested in the box.

E.g. I've got a 1 Liter res and I need to add the right amount of H2O2 using the 1:1250 ratio, how much do I add? Answer: 0.80 mL. of H202.

I've been using the imperial chart for over 4 months now. Every one of my bottles has a ratio written on the bottle (if it doesn't already) so I can simply dose according to whatever the solution size I'm working with.

• Metric Chart [PDF Download] [XLS Download]
• Imperial Chart [PDF Download] [XLS Download]

Happy growing!

Applying & Understanding TDS/EC/PPM

At first understanding TDS, EC, or what PPM truly means or how to apply it can seem a little confusing. So i'm just going to get straight to the point, and explain it how I've come to understand it.

First everything is measured as a Siemen (unit) in mS by your meter. This number is then calculated depending on how you read your meter as: EC, PPM 500, or PPM 700 using the formulas below:

mS (Microsiemen) = EC (Electrical Conductivity) so 1.0 mS = 1.0 EC (It's that straightforward.) ^{Calculator[2]}

    1.0 EC =  1.0 mS
    1.0EC x 500 = 500ppm (500 NaCl scale) or 500ppm / 500 = 1.0EC
    1.0EC x 700 = 700ppm (700 442™ scale) or 700ppm / 700 = 1.0EC

The second example below uses 2.4 mS as the base value instead of 1.0 mS as above:

    2.4 EC =  2.4 mS
    2.4EC x 500 = 1200ppm (500 NaCl scale) or 1200ppm / 500 = 2.4EC
    2.4EC x 700 = 1680ppm (700 442™ scale) or 1680ppm / 700 = 2.4EC

How your meter would calculate a solution of 1200 PPM using the PPM 500 NaCI scale:
(Note: most meters skip the step of converting µS to mS/EC and just read mS/EC)

1. Reads electrical conductivity as 2,400 µS
2. Divides 2,400 by 1,000 to get 2.4 EC/mS
3. Multiplies 2.4 EC/mS by 500 (NaCI scale) to get 1200 PPM

What if I only know my PPM & EC, what is my scale?

Switch your meter to PPM, drop in solution, let stabilize and record PPM reading.

Switch your meter to EC, record EC reading.

PPM / EC = PPM Scale

1680 / 2.4 = 700 PPM

Here is a chart:

------------------------


EC = Electrical Conductivity
TDS = Total Dissolved Solids
PPM = Parts Per Million
µS (or µS/cm) = micro-Siemens (one millionth of a siemen.)
mS (or mS/cm) = milli-Siemens (one thousandth of a siemen.)
NaCl = Sodium Chloride
KCl = Potassium Chloride
442 = 442 Natural Water (The "442" is an abbreviation for 40% sodium sulfate, 40% sodium bicarbonate and 20% sodium chloride.)